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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695d9cdd42e33fcc55c5a9044a6bc2ff6560be0da8cc84a873cea40158d7cd48' 
  AND token = 'RYrHB07tUJ4L8ktRMr5qw7JDzn/lYvtC4oQNqOMzEqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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