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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a9940053ca164d3e2d17df98624c282e22e67aeddc81bdbd12e57a5e862e1b' 
  AND token = '2RYu2YSbg1m3WvTwuF1kA2SAEvYpz3qPvACl6vz4mk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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