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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c4f9cc0ee4e8e5a669edff9e8ce63deb855f5e20bf71de68fb21ec6e309c42' 
  AND token = 'Uwa1nt9GeBrwWtzzA8yu5x5WrjnINCVB8uGfzQoQWRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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