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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba68c0de7f9cf51598fdc390927f85b75c0c2c82ffb1dcf5492ec27d0ca15c0e' 
  AND token = 'y5Z4yJ+qRmhacYCh6NF/xlDps7OoStqLTbRd9GNE1Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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