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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf78a10f362b8c1d54c25e950382cb7f75faedd4825ef6ccda664d42f2a02f6' 
  AND token = '+AvwWWIObx/I7+31TiHnK8KorJY4AYViyPQWvL8FSJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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