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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '219d591bcb5c9eda9175e94681fd0b7bfd27fe5e1f2e605eb56329a60a6eb09d' 
  AND token = 'BlbMMibMH/xxn3EsOGX0sdsn5sciEp4ScjEGlGR3h6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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