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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dda34ebbb701731b2180683302b7d71e11de90f0b0e30b4d3e96f42f8fa769b' 
  AND token = 'fhQoOwFpjZvEwDejOd5Ggu8refUzVaRng9b6MXN+CZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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