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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fcd414d7e0f85b9d13b2267be5d96ee26cb6b34f6286c29227aa8ff5ae7703' 
  AND token = '8P1XY5p+rmfgNBKF/68xZcLjU/l0NIlI6sW+PU/o9ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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