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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2985e51728e658dec13a4c04f60976dd2da6bc51ebd67a58ad3478c7dd91d7c9' 
  AND token = 'M95X+8wvc7//W62MobUBiuf/YDoOi1th8jFawEe8fJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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