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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc07fb25f48d90f3862acc855502de6d6196496db68179d7687232b7accead56' 
  AND token = 'HYsBcFN/M7JpnS+Y9d3TR0DNOatwRTDQUD+vC6YG9J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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