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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf04712a39a624097b208f6aac90661410e5ab34e6c7283af847a1b24693051' 
  AND token = 'cdiwRFsvIS3zO1qOeYvHQ/y9Wa4JtcaH0OLQxXNTlbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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