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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29d4005f2299d55c1d9fc3b3d2a8a79b24b767cc87cf9f86849368a19bf4ea15' 
  AND token = 'VGl336snJP4H1KDpwfqNmI36h9a5MdHpjaj9ecjSZuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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