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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b53ee9b8a3618ff280e123d304bc8a530473847aa68b0a5a647fecd2e78e2d5' 
  AND token = 'DCbnbrmJawjYU07myj4lpGgFnU1m1RhaTX7hpyuocdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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