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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68d0a2544f1668848da27d3215d069b800dd6e8d493db81d724a8fd8d28de12' 
  AND token = 'PNRreNYPA5gzY3WYJWgBSzbTC+mU1loeQ0iR4AjYqfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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