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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa376734c921f6617adfdcce26513c6a61c53db1908edecb26974dc9b80c7f2' 
  AND token = 'uidbSTIoQgRonJQKrU33rLlO7jIi/V3SfJKFuEa9Q48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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