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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a4a0f6191716ec93c754669c4b69e88eb7d9641e3cce3c9f98207750d87f1b1' 
  AND token = 'LNUmnNiAYCgUDxGVHB4aJnJVr6Ur8em7cNoF8ohGDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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