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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52337479cbdac2157903983156f1641e549cf79119b8b6052bae2e7af9a2a6d9' 
  AND token = '0DCSPI1xDBgulvFqRC3gm9OspiAC9Jz0gNkVyGxIMk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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