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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbdd9d78efc772fa1c83fb6ac4bf067f930af1dea132d72f8d11f0658883fb8' 
  AND token = 'W9LSqflvZrf70sVrdo+vJSEUZ/SHxYQ+sifkIptuAOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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