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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9912aae3149f9cc0133e03f182f2070915635d6b07bccee9c87a502570a3a42f' 
  AND token = '0eVEkt4vkXrK2HKt/Y84m5BirZbfD65Nfew4l8ErwTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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