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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ee52ab21c77bda92de375cf05bd77e74816eee622d44d45a3b58ae6e32811f' 
  AND token = 'd7m5u0k2MfjKm6A5jNvAb0Efcomu7s3ZSSZKUTiPyF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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