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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896174f696c9f02102b554465db1dd34652cbfccb70fdb6fc7794f2bcf245531' 
  AND token = 'WL9TZUR3FB11EtsaP/5h7wBChN9dsHim3iHqSinPTqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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