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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b211d5ad44900fc1c112414f109d18bd9e87dee06ab162f3bcb547327d5764' 
  AND token = 'J7OpD7OIOWX/1LZTdMy1SwFDtSaibrNk/ValqsEZpZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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