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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7139f4bb6d90c660f6010a42052c5c30042cbb4d0e9edae90d1e874c87eb49df' 
  AND token = 'vaWz/NztUKHz9fzShV73MtiOos2B5nZar7JjqgaXWqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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