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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980b72837a47f6da379d864c0baff7d6d5073acebee376ca889961b0187b0eb2' 
  AND token = 'ZD9W02LaNKbp3gJ9L+fVH+BOa9/ikz3bnJUpCI6lHMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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