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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faecf919777e6d5f2b209bc59334afa0def6110e27cb48260645dce8aec1a25e' 
  AND token = 'lnjwChEvF1v1QyqxX8u45+NMXkNs7BIkci3yMRhnPAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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