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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b559a12d439dfd63d82e1ba59c33b1efcd0f0b90618aeb1e3f3829feecd25b5' 
  AND token = 'm2I6R/KeNw4+U1VPFPRHgjb+y2AcMEDmm9LSKZfCYOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}