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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1b5918dbb166ec99d3e9e87dd66bbdd2802f8a1dc448d655fd72e9fa9af795' 
  AND token = 'gX/ae1gGAwZhTdhYE6QdSjsU1FTLflbvLZak6kqBiZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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