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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfde1c5c3cefef5c51d76aa9d7d3b7ba11480569cde872171ef6503e4f4408b5' 
  AND token = 'ywyB/OtnMMXu76DKe+gO8iiWcq+i6cLHm/IZ1Fqq/bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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