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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a67f0709257dceab6248313203e7bef113e857dc7ef36178f1675d3ba46a4d9' 
  AND token = 'noyPPL1NJFP65YyjCKZLUUGE7QGhDXoH7GNwSE74Qo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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