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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc0bb7cc314a00848d3537a1324fc6a6d15abff78a1da439bbea95965655e8f' 
  AND token = 'FvEwU0YYEhP02FjtyQlqTFP7axuXsmXeLn+9X2145Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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