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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e403e3c80c519d1a4baefeffb47fee4f6d10a585d681ca256ca24ba9b848583e' 
  AND token = 'rCWCuiQZaDivdcpHwJZn8nlYQf1pTNWa21Q4Xe9Y3cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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