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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12dad4f57317eb00316e6cce76f70389c9fd92100a2a56776afa925d47db1cae' 
  AND token = 'cL3Hu2Qp1vRNo/0HQHl5nqx0ROnspaRNp4a6+6nqWeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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