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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51dd58a3674da326bb3e6897e51086182c8b5aa6ac9ef9d9eb28a41526129b8' 
  AND token = 'hV9j76ZfIz3ZT5iC91MXcWMiPFbg4ruV712FWNCc2fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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