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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5088cc010a32a6bb82e88e5b259003a2c20c2074fbd1d392f1dda5ae98817f6' 
  AND token = 'nncKAm9t5pCQoi5xQGiDzvX/l+vArYyHM9YXpq9Nd5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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