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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7991c79db512e7211274c2ab2a2b8bc747e2ef5210ccd9facd699449d7742155' 
  AND token = 'L2QqUcJR/eIw55MRWqyy2MwEtimKKR9YBa5M+Y3QAB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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