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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8536614b44b3967514c88b8527db9dd7007aa75381426734b40541324ef27518' 
  AND token = 'WOzODTdl6Vr5cjv7s/6CQTXnz/R246hX4pVdnY25r88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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