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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4046b6e45df967724d87765787d976a541be34a6c661ff4e13860a290a0c18c4' 
  AND token = 'rU8lZF1eRwsobB5w2CiOBDVrtpu61eUyhHeJ39URe5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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