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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8570f3f80cecdac72042c3271cad3a59ed860ee1e2a3280473e9209c8cdd019' 
  AND token = '5jgsDlvvGab3046P3liWftuioUKr8Dtd/qNDHEhAshw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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