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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1ce8bbd1de62b7c0a54f40d9749321f6444b699b47fe7cdb89a0922f2f5106' 
  AND token = '4GqpHnTujAShJ0KUJ/b2tX9ESEiwiiwsmw3xDBLT8nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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