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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f26a61a00661190c669843c483a448e693241889401c5867b475011d427acd' 
  AND token = 'Ez1znSLcZbBtsdsmVhGpOeuAImpNn4eq0YpbK45VPA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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