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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3418f0988c6707c7e6556a043f48a6204d828ff17acc268f49ec7d17290e935' 
  AND token = 'ZCttcvtOyNGsuihTwCt2e8knLpC9aeFd7bAk1WuAqBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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