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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cdb4d0ac4a22a825a456915e6dbbcd679579acf3d6af008c7ffecbdd7d3f2da' 
  AND token = 'b0JxuCySttLpDeqbzdqhr3mKu6St0XKbLv3ss6R7R3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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