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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406f9f67461f9230c101a4799171a52f77650a6c91f12dcf6d5c14737ef0e326' 
  AND token = 'XzrLa/oCrE8myqg8rd22e9ZNKom/7heb6zSKwDS54y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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