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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae13d484300cd58212078ec80706a7d885e03c335391abf2cbe9e4ce3ae9875a' 
  AND token = '24cTxvfes5Cnx9eHDtxCOnJuwPAstUMP35wOs425shQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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