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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62f48736ba210f5e62baf64c8b2e6a4c24991416fb23defa0cf296437f6fd0c' 
  AND token = 'U9GkdYKeprpIrXpWu50Mki2s12ep8g4p+pH4vXbZqi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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