SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0437c7e35a8fa47d144f8eda7d21b1dfd55c189b7ad254940fbca3cf6c227f1' 
  AND token = 'CvfEywLmJDIrUn4IzKrbgWgD0H9CzuY5gPF2K/GUKbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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