SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b1f6e26aed2bfd43c9aa83c6f82915660c48c8934976d5ceab4d638a5b10f5' 
  AND token = 'G0G9Wr4AYxB0CLg+HhMZLYfVWsvkXkkShNE7I7FZMDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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