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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a8a16e5ee7c1fd764988fd2e3c9be3f165ff42770521f197c9bf5735a5701b' 
  AND token = 'CBlezrJjdRU64iaSUDWIZwi51SPPkU9+J21PeXFxKbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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