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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cb37c6fb77c8f8d9d42131066619057b9e51e165fb8b77ffa85cfb1e9239b7' 
  AND token = 'zBXHrfx4GYL7T0HE391n42cQZGYYOncCSVXmYHfBgxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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