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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35de8b9576c854d8e8ecf86ef5b6aa42a3d66aa2dc781c5817b37d0b4f31f0e5' 
  AND token = 'BUtFBOGPXemuNX1hiUj4cFSGufkTulro4+nW2x/uE7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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