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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06b4cd14845490fee57f777bf974e59247acf0cd2e7aa03898f628bf52f2270' 
  AND token = 'c2DJemZCqc3WfH2s9jcZAZkRFGiZMoXA8ZUd71rEiUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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