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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827c57a397299492db3ad138bd0d596035c8ad79327faf1254b6b7c2de1955d8' 
  AND token = 'E6XgWW5MN0Vi53oE5onP/Xuz0cUd6QhVI4QwP6fBJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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