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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24a8c1f47c08df2cbb95492dc347e46b95bfd3c8ddd20a3855724fc80238808' 
  AND token = '6jQwW6+BfZhTa6YjGL2X3jZAO2r7vsQvrtfp80Hfh+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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