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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca0a41f29bebb50686b8806c7e3feba5b90df455baee7db6e1d2e71a50d62d6' 
  AND token = 'k1H/L/WLcPGkaNquCFWARO+cdb3u4xxZru2aW77BjS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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