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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d2c6219ebdce2cac12cf3806073031e1784c8b0e9a29f6f76c16f9fa11ad38' 
  AND token = 'uDeR6vIEqGuauPsoVAfPv9fh7Kod9sM29GXEC6lOM0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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