SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc31258ceb00196867f0e5d1895f4ef5fc600882df327e614aef8c190894f46' 
  AND token = 'CK4CCNg/V5P4YUK9LT70DBQxYZzhvGG63dyCs0u51Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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