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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47645a4f73eba22868d2fadda7220bf386c6f0f9b11c0f8ead4d17d280946635' 
  AND token = 'Kp2b3HPopeAkuCIvOW2GZRtoG2oiZElDEy7NYLe6IAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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