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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798fdc44d7e7ff175f91b56842181b6007c130631f0446d147f5610e2b17425c' 
  AND token = 'R6GYIBlXDvfaol33pcPTsjOcVASei/FWFJR9rA2yw7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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