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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37fdf72e0c81d925f7bd108be24fcfa40d432407cae8ed6f1f24e783a7bbde8' 
  AND token = '9gpPOTA4INOSQKCL4o5YJtpFc1e/BInft3TJ17ParcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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