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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31e445c70eb7fe3d822c5602002ab39911dd3ed874a6347a5fdd9f26f3ad3f5' 
  AND token = 'SW/gdB1TMBH+RsSsBNz/4kwzedZ1eaUq/1md29gumps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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