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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199539050740abb099a8770bdb49d28c6462067ee83ce3c9d519b4183363b59d' 
  AND token = '5sZ9GdwhDbXO3CKBOdXFVj2aA/44vY/8iOVipiOkZ04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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