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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db921bcb5c9ac61880d158585f3df10a6e5aff3be6a2553b3aad18e8f3f128e' 
  AND token = 'RWteC9e/tRZrIgEdxHiYuG6D1xitgWxEhvu5kvX6pYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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