SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f723635ccc82756454e2979cb3da3718cf09843c0932f5ef6967541a9ed7cea' 
  AND token = 'okEYPVlra5JoxO5ZP4bz5RgQvqTR2GmiChwVWtNjvaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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