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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45dc644de65d382e7a7dd748c5edd59cd23b0cbb8fd16fc3ddb31b14b9ad40c' 
  AND token = 'jvHKuZmebkJ0CrZw5bcRGsGfVmUY5DwNKCKe8PqaP4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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