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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7af1ff5cbf3ae14f9eb7cc53597c5fd702dcecd4c9b7a996b46ba7210470a1' 
  AND token = '6ea4X8RrY/p5TwAZkQSX2Dt9xEDc3ZYkj69E/jV5VuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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